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Otherwise it's too difficult to analyse.

These files aren't necessary for publication to the students

We use a tree box type to prevent problems with TEALs type checking...

Refined the description of the output format.

Added details about builtins and null.

So students don't try to implement it.

With expected output.

Doesn't use classes (not available in TEAL-2).

Right now, throws a NullPointerException